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博碩士論文 etd-0703106-113812 詳細資訊
Title page for etd-0703106-113812
論文名稱
Title
應用改善後的等效傳輸線法分析含槽孔之金屬盒的屏蔽效應
Improved Equivalent Transmission Line Method for the Shielding Effectiveness of Metal Enclosures with Apertures
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
60
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2006-06-26
繳交日期
Date of Submission
2006-07-03
關鍵字
Keywords
時域有限差分、等效傳輸線法、共振腔
Finite-Difference Time Domain( FDTD), Cavity, Equivalent Transmission Line(ETL)
統計
Statistics
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中文摘要
由於含槽孔的金屬盒屬於共振腔形式的結構,全波模擬類型的FDTD方法在分析此類結構是十分沒效率的,因此便有解析公式形式的ETL方法提供另一種分析方式,雖然解析公式所能模擬的結構不如全波模擬來的複雜,但是在執行時間上解決了全波模擬的缺點,相對地,顧此失彼的結果造成無法得到良好的精準度

所以論文中提出兩項改善方式,一個是針對模擬結構作改良,另一個則是針對精準度的缺失,加入原本ETL沒有考慮的高階模態,使求出的結果能夠更準確,進而使方法所適用的範圍更廣,結果更有其可靠度。
Abstract
Because the metal enclosure with apertures is the structure of the cavity form, FDTD method belonging to full-wave analytical algorithm isn’t efficient for analyzing such case. Thereby the ETL method belonging to analytical formulation provides another way to analyze it. Although the structure which it can apply to isn’t as complex as that in full-wave analytical algorithm, the computing time is shorter than FDTD. In contrast, the method can’t get good agreement.

Thus two improved ways are introduced in this paper. One is to make the suitable structure wider and the other is to consider the higher mode original ETL method isn’t included to improve the accuracy. Further these two ways make the suitable range of the method wider and the method has good practicability.
目次 Table of Contents
Table of contents

Table of contents……..…………………………………………………………….....iv
Lists of figures and tables…..………………………………………………………... .v
Chapter 1 Introduction……..………………………………………………………1
1-1 Concepts..…………………………………………………………………1
1-2 Outline………………………………………………………………………4
Chapter 2 Formulas of TF/SF……...……………………………………………….5
2-1 Concepts……….……………………...…………………………………….5
2-2 Formulas of one-dimension….……. ……………………………………….6
2-3 Calculating incident wave…..……. …………………………………….….7
2-4 Dealing with different incident angle……….………………………………8
2-5 Application way to incident function in TF/SF.…..…….…………………10
2-6 Simulation test…………...…….….…………………….…………………12
Chapter 3 ETL method………………………………………...………………….14
3-1 Introduction of ETL method……...…………..……………………………14
3-2 Simulation test………………………………….………………………….19
Chapter 4 Two improved ways to ETL method…………………………………..22
4-1 First modified way……...……………….……..………………………….22
4-2 Simulation test in the first improved way…….…….……..………………25
4-3 Second modified way……….……….….…………………….……..….…34
Chapter 5 Final simulation test…………..………………………………………..37
5-1 Simulation test……………………………………..………………………37
5-2 Explanation and discussion…………………………………………..……44
Chapter 6 Conlusion….……………………..………………………………………..48
Reference……………………………………………………………………………..50

List of figures and tables

Figure 2.1 Space setting of TF/SF……..………………………………………………6
Figure 2.2 Cell distribution of one-dimension of FDTD in TF/SF……..……..………6
Figure 2.3 Diagram which the UPW propagates in two-dimension space ….9
Figure 2.4 Diagram which the UPW propagates in two-dimension space
…………….…………………………………………….10
Figure 2.5 Simulation results of TF/SF……………………………………………....13
Figure 3.1 Structure diagram………………..………..………………………………14
Figure 3.2 Equivalent circuit of figure 3.1………………...…………………………16
Figure 3.3 First step of simplifying the circuit……………..…………...……………17
Figure 3.4 Second step of simplifying the circuit………...……………….…………18
Figure 3.5 Third step of simplifying the circuit………...………..…………………..19
Table 3.1 parameters in the non-modified method……………….……………..……20
Figure 3.6 Results compared between FDTD and ETL method………..……………21
Figure 4.1 Structure diagram………..……………......………………………………23
Figure 4.2 Rectangular wave guide containing the metal plate with the aperture…...23
Figure 4.3 Structure which the aperture isn’t fixed at the center of aperture plane….24
Table 4.1 Parameters in the first modified way (1)…….…………..…...……………25
Table 4.2 parameters in the first modified way (2)……….……………….…………26
Table 4.3 parameters in the first modified way (3)……….………………..…...……26
Figure 4.4 Diagram of the position of the aperture (table 4.1)………..……...………26
Figure 4.5 Diagram of the position of the aperture (table 4.2)…………….…………26
Figure 4.6 Diagram of the position of the aperture (table 4.3)……………...………..27
Figure 4.7 Diagram of the position of the aperture (table 4.4)…….…………………27
Table 4.4 parameters in the first modified way (4)……………..……………………27
Table 4.5 parameters in the first modified way (5).……….…………………………28
Figure 4.8 Diagram of the position of the aperture (table 4.5)……….………………28
Figure 4.9 Results from the setting in table 4.1……….……………......……………29
Figure 4.10 Results from the setting in table 4.2…..…...……………………………30
Figure 4.11 Results from the setting in table 4.3………....…………………..………31
Figure 4.12 Results from the setting in table 4.4……….……………….…...………32
Figure 4.13 Results from the setting in table 4.5…….………………………………33
Figure 4.14 Equivalent circuit including the two modified ways….…...……………36
Figure 5.1 Diagram of the position of the aperture (table 5.1)…….…………………37
Table 5.1 Parameters in the modified ETL including two ways(1)….…….…………37
Table 5.2 parameters in the modified ETL including two ways(2)………………..…37
Table 5.3 parameters in the modified ETL including two ways(3)……………..……38
Figure 5.2 Diagram of the position of the aperture (table 5.2)…………….…………38
Figure 5.3 Diagram of the position of the aperture (table 5.3)…………..…...………38
Figure 5.4 Results from the setting in table 5.1…………………...…………………39
Figure 5.5 Results from the setting in table 5.2……….……...……...………………40
Figure 5.6 Results from the setting in table 5.3………………...……………………41
Figure 5.7 Effects of apertures on induced currents on shields…………..…..………42
Figure 5.8 Rough diagram of the position of the aperture (table 5.4)………..………43
Table 5.4 Parameters which the real size of the aperture is considered……...………43
Table 5.5 Relation between modes and resonant frequencies………….….…………44
Figure 5.9 Results which the real size of the aperture is considered……....…………44
Figure 5.10 Diagram of loop inducing in cavity……..……………………....………45
Table 5.6 Parameters which the real size of the aperture is considered……...………45
Table 5.7 Relation between mode, mode frequency and resonant frequency (1)……46
Table 5.8 Relation between mode, mode frequency and resonant frequency (2)……46
Figure 5.11 Results as considering the real size of the aperture and metal enclosure.47
參考文獻 References
[1] C. H. Kraft, “Modeling leakage through finite apertures with TLM,”in IEEE Int. Symp. Electromagn. Compat., Chicago, IL, pp.73-76, Aug. 1994.
[2] K. S. Kunz and R. J. Luebbers, The Finite Difference Time Domain Method for Electromagnetics. Orlando, FL: CRC, 1993.
[3] G. Cerri, R. De Leo, and V. M. Primiani, “Theoretical and experimental evaluation of the electromagnetic radiation from apertures in shielded enclosures,”IEEE Trans. Electromagn. Compat., vol. 34, pp.423-432, Nov. 1992.
[4] H. A. Bethe, “Theory of diffraction by small holes,”Phy. Rev. 2nd Ser., vol. 66, pp. 163-182, 1944
[5] D. A. Hill, M. T. Ma, A. R. Ondrejka, B. F. Riddle, and M. L. Crawford, “Aperture excitation of electrically large, lossy cavities,”IEEE Trans. Electromagn. Compat., vol. 36, pp. 169-178, Aug. 1994.
[6] W. Henry Ott, Noise Reduction Techniques in Electronic Systems, 2nd ed. New York: Wiley, 1988 (ISBN 0-471-85068)
[7] M.P. Robinson, T.M. Benson, C. Christopoulos, J.F. Dawson, M.D. Ganley, A.C. Marvin, S.J. Porter, and D.W.P. Thomas,“Analytical formulation for the shielding effectiveness of enclosures with apertures”, IEEE Trans. on Electromagn. Compat., vol. 40, pp240-248, Aug. 1998.
[8] K. R., Umashankar, and A . Taflove, “A novel method to analyze electromagnetic scattering of complex objects, “IEEE Trans. Electromagn. Compat., vol. 24, pp. 397-405 1982.
[9] K. C. Gupta, R. Garg, and I. J. Bahl, Microstrip Lines and Slotlines. Norwood, MA: Artech House, ch. 7, 1979.
[10] T. Konefal, J.F. Dawson, A.C. Marvin,“Improved aperture model for shielding prediction”, IEEE International Symp. on Electromagn. Compat., vol. 18-22, pp 187-192, Aug. 2003.
[11] L. Lewin, Theory of waveguides, Butterworth & Co(Publishers) Ltd, London, England, 1975 (ISBN 0-408-70561 2)
[12] I. Belokour, and J. LoVetri, “A 2D-transmission line model for the EM field estimation inside enclosures with apertures”, IEEE International Symp. on Electromagn. Compat., Minneapolis, Minnesota, pp424-429, Aug., 2002.
[13] P. Sewell, J.D. Turner, M.P. Robinson, D.W.P. Thomas, T.M. Benson, C. Chritopoulos, J.F. Dawson, M.D. Ganley, A.C. Marvin, and S.J. Porter, “Comparison of analytic, numerical and approximate models for shielding effectiveness with measurement”, IEE Proceedings on Science, Measurement and Technology, vol. 145, pp61-66, No.2. March 1998.
[14] I. Belokour, and J. LoVetri, “A higher-order mode transmission line model of the shielding effectiveness of Enclosures with apertures”, 2001 IEEE EMC International Symp. Proceedings, Montreal, Quebec., pp702-707, 2001.
[15] M.P. Ronbinson, J.D Turner, D.W.P. Thomas, J.F. Disown, M.D. Ganley, A.C. Marvin, S.J. Porter, T.M. Benson and C. Christopoulos, “Shielding effectiveness of a rectangular enclosure with a rectangular aperture,”, Electromagnetic Letters, vol. 32, pp1559-1560, No. 17, 1996.
[16] R. Collin, Field Theory of Guided Waves, McGraw-Hill Book Company, Inc., NY, 1960
[17] R. Azaro, S. Caorsi, M. Donelli, and G.L. Gragnani, “Evaluation of the effects of an external incident electromagnetic wave on metallic enclosures with rectangular apertures ,”Microwave and Optical Technology Letters, vol. 28, pp289-293, No. 5, March 2001.
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